Applegate Valley is the valley of the Applegate River in Southern Oregon, United States and extending slightly into Northern California. Applegate Valley is in Jackson County to the east and Josephine County to the west, and includes a little bit of Siskiyou County in California near Applegate Lake. It encompasses the area between Jacksonville and Grants Pas…Applegate Valley is the valley of the Applegate River in Southern Oregon, United States and extending slightly into Northern California. Applegate Valley is in Jackson County to the east and Josephine County to the west, and includes a little bit of Siskiyou County in California near Applegate Lake. It encompasses the area between Jacksonville and Grants Pass. Oregon Route 238 is a main route through the valley. The five recognized unincorporated communities in Applegate Valley are Ruch and Applegate in Jackson County, and Williams, Murphy, and Wilderville in Josephine County.